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发明名称
Stand for visible indexes
摘要
申请公布号
US1766940(A)
申请公布日期
1930.06.24
申请号
US19280272599
申请日期
1928.04.25
申请人
ACME CARD SYSTEM COMPANY
发明人
POWELL FRANK D.
分类号
B42F17/28
主分类号
B42F17/28
代理机构
代理人
主权项
地址
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